A250471 - OEIS

%I #10 Dec 13 2014 00:40:32

%S 1,2,3,5,4,8,6,11,13,14,7,17,9,20,18,23,10,26,12,29,28,32,15,35,25,38,

%T 33,41,16,44,19,47,43,50,39,53,21,56,48,59,22,62,24,65,58,68,27,71,61,

%U 74,63,77,30,80,46,83,73,86,31,89,34,92,78,95,60,98,36,101,88,104,37,107,40,110,93,113,72,116,42,119,103,122,45,125,67,128,108,131,49

%N Permutation of natural numbers: a(n) = (A250469(n) + 1) / 2.

%H Antti Karttunen, <a href="/A250471/b250471.txt">Table of n, a(n) for n = 1..5002</a>

%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>

%F a(n) = (A250469(n) + 1) / 2.

%o (Scheme) (define (A250471 n) (/ (+ 1 (A250469 n)) 2))

%Y Inverse: A250472.

%Y Cf. A048673, A250469.

%K nonn

%O 1,2

%A _Antti Karttunen_, Dec 06 2014